I don´t know why and i don´t know how this error appeared, but I wrote my programm and everything was fine,Until i editet my xml file (layout)(added some buttons and labels).Suddenly there were some strange errors that made eclipse 3.4 crash.Since then i always get the error "R cannot be resolved" if i write this "setContentView(R.layout.main);" or any other layoutalso theres an error that says unknown aadt error, check console but the console is empty.. ?

i thought of creating a new projekt and simply copy the code into itbut then i get this error and everything is redString cannot resolved to a typeint cannot resolved to a typeFile cannot resolved to a type........ almost everything

Do i have to reinstall everything, or is this a very simple thing I can fix?

Try a Clean and a Build of your project.Installing Eclipse 3.5.1/Ganimede (Google advised) or 3.6/Helios (current release) won't hurt either, as a lot of the performance issues and bugs found in 3.4 (2008 released...) are fixed. Eclipse can't be upgraded from 3.x to 3.y, so a new install (and plugins install) is required. A lot of 3rd party plugins have specific releases for each Eclipse version, so it might take a little time The Google Android SDK plugin isn't that picky about Eclipse versions, I've been using it successfully on 3.6, but Google recommends the 3.5.1 release.

wow thanks i installed eclipse 3.6 now and everything works great THANKS

edit: one litle problem

i tryed to test my app , it is starting the emulator, and the console says succesfully installed,(the emulator itself does not show that it is installing) and i can´t find the app on the emulator? ( my first application )